问题 多选题

在A地用物体m1、B地用物体m2做同样的实验:用竖直向上的力F拉物体,测量物体的加速度a与拉力F间的关系.然后把在两地测得的结果画在同一个a-F图象中,得到如图所示的加速度a与拉力F的关系图线(A)和(B).若A、B两地的重力加速度分别为g1和g2,由图象可知(  )

A.m1>m2

B.m1<m2

C.g1>g2

D.g1<g2

答案

根据牛顿第二定律得,F-mg=ma,则a=

F
m
-g.

知图线的斜率表示质量的倒数,纵轴截距的大小表示重力加速度.

从图象上看,A图线的斜率大于B图线的斜率,则m1<m2,B的纵轴截距小于A的纵轴截距,则g1>g2.故BC正确,AD错误.

故选BC.

阅读理解

根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。   (注意:E="AB;" F="AC;" G=AD)

The Winner’s Guide to Success

How do successful people think? What helps them to make success? To find out the answers, an American scholar recently visited some of the most successful people in America.   小题1:  

Be responsible for yourself

Sometimes you may want to blame others for your failure to get ahead.   小题2:  You’re saying, “You have more control over my life than I do.”

Live life “on purpose”

Almost all successful people live life “on purpose”— they are doing what they believe they should and want to do. When you live your life on purpose, you’ll try your best to do your job or study as well as you can. You love what you do and you can find pleasure in what you do.

Write a plan

It is very difficult trying to get what you want without a good plan. 小题3:  A good plan is like a map to you. Without this “map”, you may waste your time, money and also your energy; while with the “map” you’ll enjoy the “trip” and get what you want in the shortest possible time.

Be willing to pay the price

Nothing great is easy to get. So you must be ready to work hard — even harder than you have ever done. If you are not willing to pay the price, you won’t get anything valuable.

Never give up

  小题4:   When you are doing something, you must tell yourself again and again: Giving up is worse than failure because failure can be the mother of success, but giving up means the death of hope.

  小题5:  

Once an American writer was writing a novel. He could not have a good ending for his book until one night when he had a very good idea. He was so excited that he made a phone call to one of his best friends. “I’ve got a perfect idea,” he said, “I’ll put it down later and show it to you.” But he never did, because he died that night. His book was left without a perfect ending. So remember, do what you can right away. Never delay at all. 

A.In fact, when you say someone or something outside of yourself is stopping you from making success, you’re giving away your own power.

B.It is just like trying to drive through strange roads to a city far away.

C.Some people achieve success much later in life because they fail to realize earlier the importance of hard work.

D.Here are some keys to success that they give.E. Make a decision

F. It seems to us that everyone knows this. But it is easier said than done.

G. Don’t delay

单项选择题